The CBI has written to the West Bengal police chief wanting to question four senior IPS officers in the state, including Kolkata Police Commissioner Rajiv Kumar, in connection with the multi-crore Saradha chit fund scam, an agency official said on Wednesday.

The letter sent to state's Director General of Police Virendra by the Central Bureau of Investigation (CBI) mentions city police chief Rajiv Kumar, Additional Commissioner Vinit Goel, IG (Rail) Tamal Bose and former state CID chief Pallav Kanti Ghosh for questioning.